Police sources said motorcycle-riding armed men opened fire at the labourers on Sariab road, critically injuring them. The assailants fled from the scene after the attack.
The victims succumbed to their wounds while rescue teams were shifting them to a nearby hospital.
Police stated that both victims had received multiple bullet injuries.
The bodies were dhifted to Civil Hospital Quetta for post-mortem.
Police and personnel of frontier corps reached the spot arrived at the attack site and cordoned off the area as a probe into the incident went underway.
No immediate claim of responsibility was made following the attacks.